Spray dryers and spray drying towers are the most widely used processes in the liquid forming and drying industries. It is most suitable for the production of powdery, granular solid products from suspoemulsions, solutions, emulsions and pasty liquid raw materials. Therefore, the spray dryer is an ideal drying process when the particle size distribution, residual moisture content, bulk density, and particle shape of the finished product meet the exact criteria.

Points

1. Contact of hot air flow with droplets: When there is a sufficient amount of hot air flow into the spray drying chamber, the direction and angle of the hot air flow must be taken into account. Whether it is cocurrent, countercurrent or mixed flow, sufficient contact with the droplets can be ensured. Full heat exchange.

2. Atomization: The atomization system of the spray dryer must ensure uniform droplet size distribution, which is crucial. Because this can ensure the qualified rate of product quality.

3. Design of pipeline angle and cone angle: We have obtained some empirical data from the production of nearly one thousand spray dryer units, which can be shared with everyone.

Features

1. The spray drying speed is fast, and the surface area of ​​the sprayed liquid is greatly increased after atomization. In the process of contact with hot air, 95%-98% of water can be instantly evaporated, and the drying time is only a few seconds. It is especially suitable for heat-sensitive materials. Drying.

2. The product has a good uniformity, fluidity and solubility, the higher the product purity, good quality.

3. Spray dryer production process is simplified, easy operation and control. For liquids with a moisture content of 40-60% (up to 90% for special materials), the liquid can be dried once into a powdered product, without crushing and screening after drying, reducing the production process and increasing the product purity. The product particle size, bulk density and moisture content can be adjusted within a certain range by changing the operating conditions. The control and management are very convenient.

Working principle:

The spray dryer is an open cycle, parallel flow, centrifugal atomization. Drying medium air is filtered by an initial and intermediate efficiency air filter, sucked by a blower according to operating instructions, and then heated by a heater and passed through a hot air distributor of a high-efficiency filter to enter the spray drying main tower. The liquid material passes through the peristaltic pump according to the operation instructions and enters the high-speed rotating centrifugal nozzle, and is dispersed into small droplets under the action of centrifugal force. In the spray drying main tower, small droplets are in full contact with the hot air and heat-exchanged along their specific path and dried to become products. Then the separation is achieved by a cyclone separator, solid materials are collected, and the gaseous medium is filtered after being discharged. . The entire spray system is easy to clean and free of dead spots and meets GMP requirements.